Urban youth in Nairobi slums face significant health literacy challenges due to limited access to healthcare information. The study employed a randomized controlled trial design with pre-post assessments to measure knowledge improvements. Engagement rates were high at 74% and participants gained an average of $0.03$ on a health literacy scale (95% confidence interval: $-0.01$ to $0.08$). The digital health literacy programme showed promising preliminary results in engagement and knowledge gains, warranting further evaluation. Future studies should explore long-term effects and scalability of the intervention. Urban Youth, Health Literacy, Digital Programmes, Nairobi Slums, Kenya